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3. Interlocking with Bobbin Thread The bobbin case, which holds the bottom thread, is designed to catch this loop. As the needle continues to move up, the loop tightens around the bobbin thread, creating the lock stitch. Once the loop is locked in place, the needle continues its downward motion, pulling the newly formed stitch tight against the fabric.

When it comes to sewing leather, the type of thread you use is just as important as the needle. Polyester or nylon threads are highly recommended as they provide strength and durability. Avoid cotton threads, as they can easily break under tension. For added strength, consider using thicker thread, such as a 30 or 40 weight, but ensure that your machine can handle it without jamming.